JMAC CUSTOMS RRD-4C-28F KEYMOUNT BRAKE 1/2x28

(R)ecoil (R)eduction (D)evice (4)ports (C)ompensator (1/2x28) thread pitch (F)acemount (KM) KeyMount The best of both worlds! Our super effective RRD-4C muzzle brake with KEYMO suppressor mount!  This RRD-4C is designed to be permanently attached to a 14.5 inch barrel and allows you to attach KeyMount compatible devices and suppressors! We recommend this muzzle device be professionally installed on our 14.5" barrel by one of our Kalashnismiths to ensure alignment. 1/2-28 threads 2.82" long Only adds 1.5" Sleeves the barrel 1.32" 17-4ph Stainless 3.6oz *Not intended or recommend for barrels shorter than 10.5” (see below) *When testing these devices, we found that high rates of fire such as full auto or “mag dumps” could cause damage to the device due to the excess heat, pressure, and gasses from unburnt powder on shorter barrels. *This WILL NOT work on a standard 1/2-28 AR-15 barrel. Barrel must extend at least 1.32” from the gas block. BARREL DIAMETER MUST BE <0.585" This device